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Elenna [48]
2 years ago
5

determine the loudness (in decibels) of the sound at a rock concert if the intensity of the sound is 1 x 10–1 w/m2. remember, th

e intensity of the softest sound that can be heard is 1 x 10–12 w/m2.
Physics
1 answer:
EleoNora [17]2 years ago
4 0

The loudness of the sound at the rock concert, where the intensity of the sound is1 x 10⁻¹ Wm⁻² is  110 dB.

Here we are dealing with loudness which is the perception of the Intensity of the sound.

The formula  to refer to in order  to  find the value of the loudness of a sound is ,

  db= 10log(I/I₀)

As we are provided with the current intensity which is  1 x 10⁻¹ Wm⁻². and the initial intensity which is  1 x 10⁻¹² Wm⁻².

So, by substituting the required values in the formula we get

db= 10 * log( 1 x 10⁻¹ /1 x 10⁻¹²)

 = 10 * 11 log(10)

 = 110

So, the result is 110 dB.

To know more about the intensity of sound refer to the link brainly.com/question/9323731?referrer=searchResults.

To know more about questions related to loudness refer to the link brainly.com/question/21094511?referrer=searchResults.

#SPJ4

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<h3>What is Magnetic Line of Force ?</h3>

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5 0
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A lawn mower has a flat, rod-shaped steel blade that rotates about its center. The mass of the blade is 0.65 kg and its length i
Klio2033 [76]

Complete Question

A lawn mower has a flat, rod-shaped steel blade that rotates about its center. The mass of the blade is 0.65 kg and its length is 0.55 m. You may want to review (Pages 314 - 318) .

Part A What is the rotational energy of the blade at its operating angular speed of 3510 rpm

Part B

If all of the rotational kinetic energy of the blade could be converted to gravitational potential energy, to what height would the blade rise?

Answer:

Part A  

    R =  1081 \ J

Part B  

     h =  169.7 \ m

Explanation:

From the question we are told that

  The mass of the blade is  m_b  =  0.65 \ kg

   The length is  l = 0.55 \ m

   The angular speed is  w =  3510 rpm  =  3510 *  \frac{2 \pi }{60} = 367.6 \ rad/sec

Generally the moment of inertia of the of this mower is mathematically evaluated as

         I  =  \frac{m_b  * l^2 }{12}

substituting values

         I  =  \frac{0.65  * 0.55^2 }{12}

         I  =  0.016 \ kg m^2

Generally the rotational kinetic energy of the bland is  

        R =  \frac{1}{2}  * I  * w^2

substituting values

       R =  \frac{1}{2}  * 0.016 * 367.6^2

     R =  1081 \ J

At point where the gravitational potential energy is equal to the rotational kinetic energy  we have that

       P  = R =  m_b * h * g

Where P is the  gravitational potential energy

substituting values

          1081  =  0.65 * 9.8 * h

=>       h =  169.7 \ m

       

7 0
3 years ago
Violet light of wavelength 427 nm ejects electrons with a maximum kinetic energy of 0.684 eV from a certain metal. What is the w
frutty [35]

Answer:

The work function of the metal is 2.226 eV.

Explanation:

Given;

wavelength of the violet light, λ = 427 nm = 427 x 10⁻⁹ m

maximum kinetic energy, K.E = 0.684 eV

The energy of the incident light is calculated as;

E = hf = \frac{hc}{\lambda} = \frac{6.626 \ \times \ 10^{-34} \ \times\ 3\ \times \ 10^8 }{427 \ \times \ 10^{-9}} = 4.655 \ \times \ 10^{-19} \ J\\\\1 \ eV = 1.6 \ \times \ 10^{-19} \ J\\\\E =( \frac{4.655 \ \times \ 10^{-19} \ J }{1.6 \ \times \ 10^{-19} \ J} ) \ eV\\\\E = 2.91 \ eV

Apply Einstein's photoelectric equation;

E = Ф + K.E

where;

Ф is the work function of the metal

Ф  = E - K.E

Ф  = 2.91 eV - 0.684 eV

Ф  = 2.226 eV.

Therefore, the work function of the metal is 2.226 eV.

5 0
3 years ago
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